KR20190016268A - Pedal displacement measurement apparatus and electric brake systme including thereof - Google Patents

Abstract

Provided are a pedal displacement measurement apparatus and an electronic brake system including the same, capable of estimating displacement of a pedal without a separate housing or printed circuit board (PCB) to reduce a cost for installing the separate housing or PCB. According to an embodiment of the present invention, the pedal displacement measurement apparatus in an electronic brake system including a hydraulic control device operated by an electrical signal output corresponding to displacement of a brake pedal includes: a first piston moving according to the displacement of the brake pedal to generate a hydraulic pressure; a first gear provided on the outer surface of the first piston in the moving direction of the first piston; a second gear having a pitch different from the pitch of the first gear, and provided on the outer surface of the piston in parallel with the first gear; a sensing unit for sensing a change in the magnetic field of a first magnet that rotates in engagement with the pitch included in the first gear to generate a magnetic field, and sensing a change in the magnetic field of a second magnet that rotates in engagement with the pitch included in the second gear to generate a magnetic field; and a control unit for estimating displacement of the first piston based on the change in the magnetic fields of the first magnet and the second magnet.

Description

TECHNICAL FIELD [0001] The present invention relates to a pedal displacement measuring apparatus and an electronic brake system including the pedal displacement measuring apparatus.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pedal displacement measuring apparatus and an electronic brake system including the same, and more particularly, to an electronic brake system for measuring a displacement of a brake pedal and generating a braking force using an electrical signal corresponding to a displacement of the measured pedal .

The vehicle is essentially equipped with a brake system for braking. Recently, various types of systems have been proposed to obtain a more powerful and stable braking force.

Examples of the brake system include an anti-lock brake system (ABS) that prevents slippage of the wheel during braking, a brake traction control system (BTCS: Brake) that prevents slippage of the drive wheels And an electronic stability control system (ESC) that stably maintains the running state of the vehicle by controlling the brake hydraulic pressure by combining an anti-lock brake system and traction control.

Generally, an electronic brake system includes a hydraulic pressure supply device that receives an electric signal of a driver's braking will from a pedal displacement sensor that senses displacement of a brake pedal when the driver depresses the brake pedal, and supplies pressure to the wheel cylinder.

Accordingly, the hydraulic pressure supply device is configured to measure the pressure of the brake pedal from a pedal displacement sensor that senses the displacement of the brake pedal, and to operate the motor in accordance with the electrical signal to generate the braking pressure. At this time, the braking pressure is generated by converting the rotational force of the motor into a linear motion and pressing the piston.

However, when the pedal displacement sensor is separately mounted, a separate housing is required, or a separate PCB is required to be added.

In addition, when a failure occurs in the pedal displacement sensor, there is a problem that a device that can replace the pedal displacement sensor is separately required.

In addition to mounting the pedal displacement sensor separately, research on the method for measuring the displacement of the pedal in the conventional electronic brake system has been continued.

      Embodiments of the present invention attempt to estimate the displacement of a pedal without a separate housing or PCB (Printed Circuit Board) to reduce the cost of installing a separate housing or PCB.

In addition, a method of estimating the displacement of the pedal when the pedal displacement sensor, which is included in the conventional electronic brake system and is separately mounted, fails.

According to an aspect of the present invention, there is provided an electronic brake system including a hydraulic control device operated by an electrical signal outputted in response to a displacement of a brake pedal, A first gear disposed on an outer surface of the first piston and having a pitch different from that of the first gear and a second gear provided on an outer surface of the piston along with the first gear, A second gear which rotates in engagement with a pitch included in the first gear to detect a change in magnetic field of the first magnet generating a magnetic field and rotates in engagement with a pitch included in the second gear to generate a magnetic field, A sensing unit sensing a change in the magnetic field of the two magnets; And a controller for estimating a displacement of the first piston based on a change in magnetic field of the first magnet and the second magnet.

The sensing unit may include a first Hall sensor that senses a change in magnetic field of the first magnet that rotates in conjunction with a pitch included in the first gear to generate a magnetic field; And a second Hall sensor for sensing a magnetic field change of the second magnet which rotates in engagement with the pitch included in the second gear to generate a magnetic field.

The electronic brake system may further include a pedal displacement sensor for measuring displacement of the brake pedal, and the control unit may operate when the pedal displacement sensor fails.

Also, the controller may estimate the displacement of the first piston by combining the sensor output values of the first hall sensor and the second hall sensor.

According to another aspect of the present invention, there is provided an electronic brake system including a hydraulic control device operated by an electrical signal outputted in response to displacement of a brake pedal, the brake system comprising: A first gear provided on an outer surface of the first piston in a moving direction of the first piston; A second gear having a pitch different from that of the first gear and provided on the outer surface of the piston in parallel with the first gear, and a second gear, which rotates in engagement with the pitch included in the first gear, A sensing unit sensing a change in the magnetic field of the magnet and detecting a change in the magnetic field of the second magnet that rotates in engagement with the pitch included in the second gear to generate a magnetic field; And a controller for estimating a displacement of the first piston based on a change in magnetic field of the first magnet and the second magnet and estimating a pedal displacement based on the displacement of the piston have.

The sensing unit may include a first Hall sensor that senses a change in magnetic field of the first magnet that rotates in conjunction with a pitch included in the first gear to generate a magnetic field; And

And a second Hall sensor for detecting a magnetic field change of the second magnet which rotates in engagement with the pitch included in the second gear to generate a magnetic field.

 The electronic brake system may further include a pedal displacement sensor for measuring displacement of the brake pedal, and the control unit may operate when the pedal displacement sensor fails.

Also, the controller may estimate the displacement of the first piston by combining the sensor output values of the first hall sensor and the second hall sensor.

The hydraulic control apparatus may further include a master cylinder including the first piston and an actuator generating a hydraulic pressure using a second piston operated by an electrical signal output corresponding to displacement of the brake pedal, A hydraulic circuit for transmitting the generated hydraulic pressure to at least one wheel; And a cut valve positioned between the master cylinder and the hydraulic circuit to control the flow of oil.

Further, the actuator can operate the second piston based on the electric signal calculated corresponding to the estimated pedal displacement.

     Embodiments of the present invention can estimate the displacement of a pedal without a separate housing or PCB (Printed Circuit Board) to reduce the cost of installing a separate housing or PCB.

In addition, it is possible to secure a method of estimating the displacement of the pedal when the pedal displacement sensor mounted in the conventional electronic brake system fails.

1 is a block diagram schematically showing a configuration of a hydraulic circuit of an electronic brake system including a pedal displacement measuring apparatus according to an embodiment.
2 is a schematic hydraulic circuit diagram showing an electronic brake system including a pedal displacement measuring apparatus according to an embodiment.
3 is a schematic view showing a pedal displacement measuring apparatus according to an embodiment.
4 is a block diagram of a pedal displacement measuring apparatus according to an embodiment.
5 is a graph showing output values of the plurality of hall sensors included in the pedal displacement measuring apparatus according to one embodiment over time.
6 is a flowchart illustrating a method of measuring a pedal displacement according to an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

Fig. 1 is a block diagram schematically showing a configuration of a hydraulic circuit of an electronic brake system including a pedal displacement measuring apparatus according to an embodiment, and Fig. 2 is a schematic diagram showing an electronic brake system including a pedal displacement measuring apparatus according to an embodiment Hydraulic circuit diagram.

First, a master cylinder 200 included in the hydraulic control apparatus 100 generates a hydraulic pressure. A reservoir (shown in FIG. 2) for storing oil is connected to an upper portion of the master cylinder 200, The master cylinder 200 is pressed in accordance with the pressing force of the brake pedal 2 contained in the master cylinder 11, and a hydraulic pressure is generated in the master cylinder 200.

The pedal portion 11 may include an input rod (not shown) to press the first piston included in the master cylinder 200.

Also, the pedal portion 11 may include a pedal displacement sensor for sensing the displacement of the pedal, although not shown.

That is, the master cylinder 200 may be configured to include at least one chamber to generate hydraulic pressure from the movement of the first piston pressurized from the input rod.

For example, the master cylinder 200 is configured to include two chambers, and each of the chambers has a first piston and a second piston, and hydraulic pressure is discharged from each of the two chambers, and hydraulic pressure is discharged to the hydraulic circuit 300 .

On the other hand, the master cylinder 200 has two chambers to ensure safety in case of failure. For example, one of the two chambers may be connected to the right front wheel FR and the left rear wheel RL of the vehicle, and the other chamber may be connected to the left front wheel FL and the right rear wheel RR. In this way, by independently configuring the two chambers, it is possible to braking the vehicle even if one of the chambers fails.

In addition, for example, the electronic brake system according to the present invention may further include a hall sensor for detecting a pedal displacement by measuring a movement amount of the first piston, which will be described in detail with reference to FIG.

Next, the hydraulic circuit 300 includes a plurality of valves 40 and a simulation valve 50. The hydraulic circuit 300 includes a plurality of valves (not shown) included in the hydraulic circuit 300 in accordance with control signals received from the electronic control unit 30, The hydraulic pressure transmitted to each wheel can be adjusted by opening and closing the valve 40.

The cut valve 201 is located between the master cylinder 200 and the hydraulic circuit 300 and controls the flow of the hydraulic pressure to the hydraulic circuit 300.

 The actuator 400 includes a motor 50, and the motor 50 can pump and supply the brake fluid to each wheel cylinder.

The hydraulic control apparatus 100 may operate according to a control signal generated in a main processor (not shown) in the electronic control unit of the electronic brake system.

Next, Fig. 2 is a schematic hydraulic circuit diagram showing an electronic brake system 1 including a pedal displacement measuring apparatus according to the embodiment of Fig.

2, the electronic brake system 1 is typically connected to a master cylinder 20 (200 of FIG. 1) generating hydraulic pressure and to an upper portion of a master cylinder 20 (FIG. 1, 200) An input rod 12 which pressurizes the master cylinder 20 (200 in Fig. 1) in accordance with the pressing force of the brake pedal 10 and a hydraulic pressure is transmitted to each wheel RR, RL, FR, FL A pedal displacement sensor PS1 for sensing the displacement of the brake pedal 10 and a simulation device 50 for providing a reaction force in response to the pedal force of the brake pedal 10. The wheel cylinder 40 performs braking of the brake pedal 10, do.

Although not shown in FIG. 1, each wheel cylinder 40 is provided with a wheel speed sensor to measure the speed of each wheel FL, RR, RL, FR.

The master cylinder 20 (200 of FIG. 1) may be configured to include at least one chamber to generate hydraulic pressure. In one example, the master cylinder 20 (200 in FIG. 1) is configured to include two chambers, each chamber being provided with a first piston 21a and a second piston 21a, the first piston 21a, Can be connected to the input rod 12. The master cylinder 20 (200 in FIG. 1) can form first and second hydraulic ports 24a and 24b, respectively, through which the hydraulic pressure is discharged from the two chambers.

On the other hand, the master cylinder 20 (200 in FIG. 1) has two chambers to ensure safety in case of failure.

For example, one of the two chambers may be connected to the right front wheel FR and the left rear wheel RL of the vehicle, and the other chamber may be connected to the left front wheel FL and the right rear wheel RR. Thus, by independently configuring the two chambers, it is possible to braking the vehicle even if one of the chambers fails.

A first spring 21b is provided between the first and second pistons 21a and 21a of the master cylinder 20 and the master cylinder 20, A second spring 22b may be provided between the end of the first spring 200 and the second spring 22b.

The first spring 21b and the second spring 22b are respectively provided in the two chambers and as the displacement of the brake pedal 10 changes, the first piston 21a and the second piston 21b are compressed, The elastic force is stored in the spring 21b and the second spring 22b. When the pushing force of the first piston 21a becomes smaller than the elastic force, the first and second pistons 21a and 22a are returned to the original state by using the elastic force stored in the first spring 21b and the second spring 22b .

On the other hand, the input rod 12, which presses the first piston 21a of the master cylinder 20 (200 of Fig. 1), can be brought into contact with the first piston 21a in close contact. That is, there may not be a gap between the master cylinder 20 (200 in FIG. 1) and the input rod 12. Therefore, when the brake pedal 10 is depressed, the master cylinder 20 (200 in Fig. 1) can be directly pressed without a pedal invalid stroke section.

3, when the gear is placed in the first piston 21a and a change in the magnetic field due to the amount of movement of the first piston 21a in engagement with the gear installed in accordance with the movement of the first piston 21a is detected, The pedal displacement according to the amount of movement of the piston can be estimated. A specific configuration and arrangement thereof will be described in detail with reference to FIG.

Next, the simulation apparatus 50 is connected to a first backup channel 251 to be described later, and can provide a reaction force corresponding to the pressing force of the brake pedal 10. The reaction force is provided as much as the driver's compensation is compensated for, so that the driver can finely adjust the braking force as intended.

2, the simulation apparatus 50 includes a simulation chamber 51 and a simulation chamber 51, which are arranged to store the oil flowing out from the first hydraulic port 24a of the master cylinder 20 (200 in Fig. 1) And a simulator valve 54 connected to the pedal simulator and the rear end of the simulation chamber 51. The simulator valve 54 includes a reaction force spring 52 and a reaction force spring 53 for elastically supporting the reaction force piston 52. [

The reaction force piston 52 and the reaction force spring 53 are installed so as to have a certain range of displacement in the simulation chamber 51 by the oil introduced into the simulation chamber 51.

The simulator valve 54 may be provided in a flow path connecting the rear end of the simulation chamber 51 and the reservoir 30. [ The front end of the simulation chamber 51 is connected to the master cylinder 20 (200 in FIG. 1), and the rear end of the simulation chamber 51 can be connected to the reservoir 30 via the simulator valve 54. Therefore, even when the reaction force piston 52 returns, oil in the reservoir 30 flows through the simulator valve 54, so that the entire interior of the simulation chamber 51 can be filled with the oil.

In the meantime, several reservoirs 30 are shown in the figure, and each reservoir 30 uses the same reference numerals. However, these reservoirs may be provided with the same parts or may be provided with different parts. In one example, the reservoir 30 connected to the simulation apparatus 50 is the same as the reservoir 30 connected to the master cylinder 20 (Fig. 1, 200) or connected to the master cylinder 20 And may be a reservoir capable of storing oil separately from the reservoir 30.

On the other hand, the simulator valve 54 may be constituted by a normally closed type solenoid valve that keeps the normally closed state. The simulator valve 54 can be opened when the driver applies pressure to the brake pedal 10 to deliver the oil in the simulation chamber 51 to the reservoir 30.

Further, a simulator check valve 55 may be provided between the pedal simulator and the reservoir 30 so as to be connected to the simulator valve 54 in parallel. The simulator check valve 55 allows the oil of the reservoir 30 to flow into the simulation chamber 51 while the oil of the simulation chamber 51 flows into the reservoir 30 through the flow path in which the check valve 55 is installed You can block things. A quick return of the pedal simulator pressure can be ensured since the oil can be supplied into the simulation chamber 51 through the simulator check valve 55 when the brake pedal 10 is depressed.

The hydraulic pressure supply apparatus 100 includes a hydraulic pressure providing unit 110 for providing oil pressure to be transmitted to the wheel cylinder 40, a motor 120 for generating a rotational force by an electrical signal of the pedal displacement measuring apparatus, And a power converting unit 130 for converting the rotational motion of the driving unit 110 into a rectilinear motion and transmitting the rectilinear motion to the hydraulic pressure providing unit 110. Or the hydraulic pressure providing unit 110 may be operated not by the driving force supplied from the motor 120 but by the pressure provided by the high pressure accumulator.

An electronic brake system 1 according to an embodiment of the present invention includes a hydraulic pressure supply device 100 that receives mechanically the displacement of a brake pedal 10 by an electric signal of a pedal displacement measuring device, A hydraulic pressure control unit 200 composed of first and second hydraulic circuits 201 and 202 for controlling the flow of hydraulic pressure transmitted to the wheel cylinders 40 provided in the first hydraulic cylinders RL, FR, and FL, A first cut valve 261 provided on a first backup passage 251 for connecting the port 24a and the first hydraulic circuit 201 to control the flow of the hydraulic pressure and a second cut valve 261 provided on the second hydraulic pressure port 24b, A second cut valve 262 provided on a second backup passage 252 connecting the circuit 202 to control the flow of the hydraulic pressure and a second cut valve 262 connected to the hydraulic pressure supply device 100 and the valves And an electronic control unit (not shown) for controlling the electronic control units 54, 60, 221a, 221b, 221c, 221d, 222a, 222b, 222c, 222d, 233, 235, 236, have.

It is possible to perform the overall control of the electronic brake system 1 of such an electronic control unit (not shown).

The hydraulic pressure providing unit 110 of the electromagnetic brake system 1 according to the embodiment of the present invention can operate in a double acting manner. That is, the hydraulic pressure generated in the first pressure chamber 112 while the hydraulic piston 114 advances is transmitted to the first hydraulic circuit 201 through the first hydraulic oil path 211 and the second hydraulic fluid path 212, The wheel cylinders 40 provided on the front wheel FR and the left rear wheel LR can be actuated and transmitted to the second hydraulic circuit 202 through the first hydraulic oil path 211 and the third hydraulic fluid path 213 So that the wheel cylinders 40 provided on the right rear wheel RR and the left front wheel FL can be actuated.

Similarly, the hydraulic pressure generated in the second pressure chamber 113 while the hydraulic pressure piston 114 moves backward is transmitted to the first hydraulic circuit 201 through the fourth hydraulic fluid passage 214 and the fifth hydraulic fluid passage 215, The wheel cylinders 40 provided on the front wheels FR and the left rear wheels LR can be actuated and transmitted to the second hydraulic circuit 202 through the fourth hydraulic fluid path 214 and the sixth hydraulic fluid path 216, So that the wheel cylinders 40 provided on the right rear wheel RR and the left front wheel FL can be actuated.

The negative pressure generated in the first pressure chamber 112 while the hydraulic piston 114 moves back sucks the oil of the wheel cylinder 40 installed in the right front wheel FR and the left rear wheel LR, (RR) and the left front wheel (FL) through the first hydraulic oil path (201), the second hydraulic oil path (212) and the first hydraulic oil path (211) The oil in the cylinder 40 can be sucked and transferred to the first pressure chamber 112 through the second hydraulic circuit 202, the third hydraulic fluid path 213, and the first hydraulic fluid path 211.

The electronic control unit (not shown) includes a plurality of valves 54, 60, 221a, 221b, 221c, 221d, 222a, and 222b provided in the electromagnetic brake system 1 of the present invention, 222b, 222c, 222d, 233, 235, 236, and 243.

In addition, an electronic control unit (not shown) will be described later on, in which a plurality of valves are controlled according to the displacement obtained from the electrical signal of the pedal displacement measuring apparatus.

That is, the electric signal of the pedal displacement measuring device is transmitted to an electronic control unit (not shown), and an electronic control unit (not shown) drives the motor 120 in one direction to rotate the worm shaft 131 in one direction . The rotational force of the warm shaft 131 is transmitted to the drive shaft 133 via the worm wheel 132 and the hydraulic pressure piston 114 connected to the drive shaft 133 moves forward to generate a hydraulic pressure in the first pressure chamber 112.

Conversely, when the brake pedal 10 is depressed, the electronic control unit (not shown) drives the motor 120 in the opposite direction and the worm shaft 131 rotates in the opposite direction. Accordingly, the worm wheel 132 also rotates in the opposite direction and generates a negative pressure in the first pressure chamber 112 while the hydraulic piston 114 connected to the drive shaft 133 returns (moves backward).

On the other hand, the hydraulic pressure and the negative pressure can be generated in the opposite direction. That is, when a displacement occurs in the brake pedal 10, an electric signal of the pedal displacement measuring device is transmitted to an electronic control unit (not shown), and an electronic control unit (not shown) And rotates the shaft 131 in the opposite direction. The rotational force of the warm shaft 131 is transmitted to the drive shaft 133 via the worm wheel 132 and the hydraulic pressure piston 114 connected to the drive shaft 133 moves backward to generate a hydraulic pressure in the second pressure chamber 113.

On the other hand, when the pressing force is removed from the brake pedal 10, the electronic control unit 2000 drives the motor 120 in one direction so that the worm shaft 131 rotates in one direction. Accordingly, the worm wheel 132 also rotates in the opposite direction and generates a negative pressure in the second pressure chamber 113 while the hydraulic piston 114 connected to the drive shaft 133 returns (advances).

The hydraulic pressure supply device 100 transfers the hydraulic pressure to the wheel cylinder 40 or sucks the hydraulic pressure to the reservoir 30 according to the rotational direction of the rotational force generated from the motor 120.

On the other hand, when the motor 120 rotates in one direction, a hydraulic pressure may be generated in the first pressure chamber 112 or a negative pressure may be generated in the second pressure chamber 113. The hydraulic pressure may be used for braking, By controlling the valves 54, 60, 221a, 221b, 221c, 221d, 222a, 222b, 222c, 222d, 233, 235, 236, 243 constituting the plurality of valves 800 Can be determined.

It should be understood that the power converting unit 130 according to the embodiment of the present invention can adopt any structure as long as it can convert rotational motion into linear motion in addition to the structure of the ball screw nut assembly.

A first cut valve 261 for controlling the flow of oil is provided in the first backup passage 251 and a second cut valve 262 for controlling the flow of oil is provided in the second backup passage 252 have. The first backup hydraulic passage 251 connects the first hydraulic pressure port 24a to the first hydraulic pressure circuit 201 and the second backup hydraulic passage 252 connects the second hydraulic pressure port 24b and the second hydraulic circuit 202 can be connected.

The first and second cut valves 261 and 262 may be provided with a normally open type solenoid valve that is opened in a normal state and operates to close the valve when receiving a close signal from the electronic control unit have.

Next, the hydraulic control unit 200 according to the embodiment of the present invention will be described with reference to FIG.

The hydraulic control unit 200 may include a first hydraulic circuit 201 and a second hydraulic circuit 202, each of which receives hydraulic pressure and controls two wheels, respectively. For example, the first hydraulic circuit 201 controls the right front wheel FR and the left rear wheel RL, and the second hydraulic circuit 202 can control the left front wheel FL and the right rear wheel RR . The wheel cylinders 40 are provided on the respective wheels FR, FL, RR, and RL to supply hydraulic pressure to perform braking.

The first hydraulic circuit 201 is connected to the first hydraulic fluid path 211 and the second hydraulic fluid path 212 to receive the hydraulic pressure from the hydraulic pressure supply device 100. The second hydraulic fluid path 212 is connected to the right front wheel FR ) And the left rear wheel (RL). Similarly, the second hydraulic circuit 202 is connected to the first hydraulic oil path 211 and the third hydraulic oil path 213 to receive the hydraulic pressure from the hydraulic pressure supply device 100, and the third hydraulic oil path 213 is connected to the left front wheel (FL) and the right rear wheel (RR).

The circuit diagram of the electronic brake system 1 according to the embodiment including the pedal displacement measuring apparatus according to the present invention has been described above.

Hereinafter, the operation of the electromagnetic brake system 1 according to the embodiment of the present invention will be described in detail. 3 is a schematic view showing a pedal displacement measuring apparatus according to an embodiment, and FIG. 4 is a block diagram of a pedal displacement measuring apparatus according to an embodiment.

3, a pedal displacement measuring apparatus 1050 according to an embodiment of the present invention includes a printed circuit board (PCB) 1040 including a first hall sensor H1 and a second hall sensor H2. And two magnets M1 and M2 meshing with gears G1 and G2 and two gears G1 and G2 mounted on the surface of the first piston 21a do.

Specifically, the two gears G1 and G2 have different pitches, and the pitch of engagement with the two gears G1 and G2 is located at one end of the two magnets M1 and M2.

At this time, the gears G1 and G2 are engaged with the gears G1 and G2 in accordance with the movement of the piston of the first piston (21a in Fig. 2) The first hall sensor H1 and the second hall sensor H2 detect the change of the magnetic field caused by the movement of the first Hall sensor H1.

Therefore, the first Hall sensor H1 and the second Hall sensor H2 located on the printed circuit board 1000 output the change of the magnetic field and output the sensor signal to the electronic control unit 1040 of the pedal displacement measuring apparatus 1050 according to the present invention. (1051).

4 is a block diagram of a pedal displacement measurement device 1050 according to one embodiment. 4, the pedal displacement measuring apparatus 1050 includes a sensing unit 1052, an electronic control unit 1051, and a driver 1053. [

However, the electronic brake system 1 including the pedal displacement measuring apparatus 1050 according to an embodiment may further include a pedal displacement sensor 11 in addition to the pedal displacement measuring apparatus 1050. [

Accordingly, the pedal displacement measuring apparatus 1050 according to the embodiment may operate when it is difficult to measure the pedal displacement due to the failure of the pedal displacement sensor 11 included in the electronic brake system 1. [

Specifically, the sensing unit 1052 includes a first hall sensor H1 and a second hall sensor H2. The reason that the sensing unit 1052 includes two Hall sensors is to accurately assure the absolute displacement of the first piston 21a based on the sensor signal of the Hall sensor acquired by the sensing unit 1052. [

The first Hall sensor H1 and the second Hall sensor H2 may be located on the printed circuit board 1000, as shown in FIG.

The first hall sensor H1 and the second hall sensor H2 are arranged such that the first hall sensor H1 detects a sensor signal output value by sensing a magnetic field change of the first magnet M1, A sensor signal output value that is calculated by sensing the change in the magnetic field of the second magnet M2 is calculated. 5 is a graph showing sensor signal output values of the two Hall sensors H1 and H2 included in the pedal displacement measuring apparatus 1050 according to an embodiment of the present invention.

The pitches p1 and p2 of the first and second magnets M1 and M2 located at the first piston 21a have different pitches. Thus, the change in the magnetic field generated in the first magnet M1 and the second magnet M2 has different waveforms as shown in Fig.

For example, the upper graph of FIG. 5 is a graph showing the output signal of the first Hall sensor H1 with respect to time, and the lower graph of FIG. 5 is a graph showing an output signal of the second Hall sensor H2 with respect to time .

The first hall sensor H1 is driven by the first magnet M1 to engage with a large gear. The waveform of the sensor signal outputted on the basis of the change of the magnetic field of the first hall sensor H1 is large. On the other hand, the second hall sensor H2 moves in a manner that the second magnet M2 meshes with the small gear, and the second hall sensor H2 shows a small waveform of the sensor signal outputted based on the change of the magnetic field.

The sensing unit 1052 then outputs signals output from the first Hall sensor H1 and the second Hall sensor H2 to the electronic control unit 1051. [

The electronic control unit 1052 then estimates the displacement of the first piston 21a by combining the amount of change based on the sensor signal of the first hall sensor H1 and the sensor signal of the second hall sensor H2, do.

Specifically, the electronic control unit 1052 includes a determination unit 105 and an estimation unit 106. [

The determination unit 105 receives the sensing signal of the sensing unit 1052 and determines whether the first piston 21a has moved left or right. The determination unit 105 determines whether or not the output value from the pedal displacement sensor 11 is normal when the electronic brake system 1 according to the present invention further includes the pedal displacement sensor 11, It is possible to confirm whether or not the sensor 11 has failed.

The determination unit 105 may determine whether to estimate the displacement of the piston based on the sensing signal input through the sensing unit 1052 when the mounted pedal displacement sensor 11 fails.

Therefore, when it is determined that the pedal displacement is to be estimated by the determination unit 105, the estimating unit 106 combines the sensor signal values acquired based on the first hall sensor H1 and the second hall sensor H2 signals Estimate the displacement of the pedal.

5, the estimator 106 combines the waveform of the sensor signal acquired during the same time (t), the pattern and the number of the waveform, and the like, The displacement can be estimated.

The driving unit 1053 outputs the displacement information of the pedal to the electronic brake system 1 according to the present invention on the basis of the displacement of the pedal estimated by the estimating unit 106. Based on the displacement information of the pedal, The system 1 is operated.

In the foregoing, the configuration for performing the operation of the electronic brake system 1 including the pedal displacement measurement system 1050 has been described.

Hereinafter, the control method of the pedal displacement measurement system 1050 according to the present invention will be described.

6 is a flowchart illustrating a method of measuring a pedal displacement according to an embodiment of the present invention.

First, the pedal displacement measuring apparatus according to the present invention secures the initial position of the piston (S10). Securing the initial position is to secure the initial position when estimating the displacement of the piston based on the plurality of hall sensors included in the pedal displacement measuring device.

Next, the pedal displacement measuring apparatus 1050 senses a phase change from the first hall sensor H1 and the second hall sensor H2 (S30) when the piston moves (YES in S20). At this time, the electronic control unit 1051 can ensure that the piston moves by changing the sensor signal values of the plurality of hall sensors H1 and H2 secured from the sensing unit 1052. [

Thereafter, the electronic control unit 1051 estimates the absolute position of the piston based on the phase change amount of the first hall sensor H1 and the second hall sensor H2 through the combination of the two phase shift amounts (S40).

Therefore, the electronic control unit 1051 can control the electronic brake system 1 including the pedal displacement measurement device 1050 according to the present invention based on the estimated absolute position of the piston, The absolute position is output (S50).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein; It will be understood that various modifications may be made without departing from the spirit and scope of the invention.

10: Brake pedal 11: Pedal displacement sensor
20: master cylinder 30: reservoir
40: Wheel cylinder 50: Simulation device
54: simulator valve 60: check valve
100: hydraulic pressure supply device 110: hydraulic pressure supply unit
120: motor 130: power conversion section
200: Hydraulic control unit 201: First hydraulic circuit
202: second hydraulic circuit 211: first hydraulic oil
212: second hydraulic oil passage 213: third hydraulic oil passage
214: fourth hydraulic oil rail 215: fifth hydraulic oil rail
216: sixth hydraulic oil 217: seventh hydraulic oil
218: Eighth hydraulic oil passage 221: Inlet valve
222: outlet valve 223: check valve
231: first control valve 232: second control valve
233: third control valve 234: fourth control valve
235: fifth control valve 236: sixth control valve
241: first dump valve 242: second dump valve
243: Third dump valve 251: First backup channel
252: second backup passage 261: first cut valve
262: second cut valve

Claims (10)

An electronic brake system comprising a hydraulic control device operated by an electrical signal outputted in response to displacement of a brake pedal,
A first piston moving according to a displacement of the brake pedal to generate a hydraulic pressure;
A first gear provided on an outer surface of the first piston in accordance with a moving direction of the first piston;
A second gear having a pitch different from the first gear and provided on an outer surface of the piston in parallel with the first gear;
And detects a change in the magnetic field of the first magnet that rotates in conjunction with the pitch included in the first gear to generate a magnetic field and rotates in engagement with the pitch included in the second gear to detect a change in the magnetic field of the second magnet ;
And a controller for estimating a displacement of the first piston based on a change in magnetic field of the first magnet and the second magnet. The method according to claim 1,
The sensing unit may include a first Hall sensor that senses a change in magnetic field of the first magnet that rotates in conjunction with a pitch included in the first gear to generate a magnetic field; And
And a second hall sensor for detecting a magnetic field change of the second magnet which rotates in engagement with a pitch included in the second gear to generate a magnetic field. 3. The method of claim 2,
The electronic brake system further comprises a pedal displacement sensor for measuring a displacement of the brake pedal,
Wherein the controller operates when the pedal displacement sensor fails. 3. The method of claim 2,
Wherein the control unit estimates a displacement of the first piston by combining sensor output values of the first hall sensor and the second hall sensor. An electronic brake system comprising a hydraulic control device operated by an electrical signal outputted in response to displacement of a brake pedal,
A first piston moving according to a displacement of the brake pedal to generate a hydraulic pressure;
A first gear provided on an outer surface of the first piston in accordance with a moving direction of the first piston;
A second gear having a pitch different from the first gear and provided on an outer surface of the piston in parallel with the first gear;
And detects a change in the magnetic field of the first magnet that rotates in conjunction with the pitch included in the first gear to generate a magnetic field and rotates in engagement with the pitch included in the second gear to detect a change in the magnetic field of the second magnet ;
And a controller for estimating a displacement of the first piston based on a change in the magnetic field of the first magnet and the second magnet and estimating a pedal displacement based on the displacement of the piston. 6. The method of claim 5,
The sensing unit may include a first Hall sensor that senses a change in magnetic field of the first magnet that rotates in conjunction with a pitch included in the first gear to generate a magnetic field; And
And a second Hall sensor for detecting a change in the magnetic field of the second magnet that rotates in engagement with the pitch included in the second gear to generate a magnetic field. The method according to claim 6,
The electronic brake system further comprises a pedal displacement sensor for measuring a displacement of the brake pedal,
Wherein the control unit operates when the pedal displacement sensor fails. The method according to claim 6,
Wherein the control unit estimates displacement of the first piston by combining sensor output values of the first hall sensor and the second hall sensor. 8. The method of claim 7,
The hydraulic control device
A master cylinder including the first piston;
An actuator for generating a hydraulic pressure by using a second piston operated by an electrical signal output corresponding to a displacement of the brake pedal;
A hydraulic circuit for transmitting the hydraulic pressure generated by the actuator to at least one wheel; And
And a cut valve positioned between the master cylinder and the hydraulic circuit to control the flow of oil. 10. The method of claim 9,
Wherein the actuator operates the second piston based on an electrical signal calculated corresponding to the estimated pedal displacement.

Images